Maxtla was installed as a ruler of
Coyoacán. Upon Tezozomoc's death in the year
Twelve Rabbit (1426), Tayatzin became a king, but Maxtla seized power at
Azcapotzalco, leaving the rulership of Coyoacán to his son
Tecollotzin. Emperor Chimalpopoca of
Tenochtitlan allied with Tayatzin, and the two conspired to retake the throne and kill Maxtla. Friendly relations between Tenochtitlan and Azcapotzalco were thus replaced by insults and violent intrigue, apparently involving tit-for-tat assassination attempts. Maxtla sent Chimalpopoca a present of women's clothing, and later arranged his assassination. Tayatzin was killed, and Chimalpopoca decided to offer himself as a sacrifice at the altar of his father
Huitzilíhuitl. When Maxtla laid siege to Tenochtitlan in 1428, Chimalpopoca's successor and uncle,
Itzcoatl, repelled his forces with the aid of an alliance of city states, including
Texcoco under
Nezahualcoyotl and many former Tepanec allies, notably
Tlacopan. These allied forces sacked Azcapotzalco and Maxtla was personally sacrificed by
Nezahualcoyotl, potentially because of the death of Nezahualcoyotl's father at the hands of Azcapotzalco's forces. The victorious powers formalized their relationship in the
Triple Alliance of
Tenochtitlan, Texcoco and Tlacopan, which would become the basis of the
Aztec Empire. ==Notes==